Due to the Tohoku-Chihou-Taiheiyou-Oki Earthquake which occurred on March
11, 2011, TEPCO's facilities including our nuclear power stations have
been severely damaged. We deeply apologize for the anxiety and
inconvenience caused.
With regard to the accident at Fukushima Daiichi Nuclear Power Station,
on April 17, we have compiled the roadmap towards restoration from the
accident and then we updated the progress status of roadmap considering
the current situation, on July 19. Accomplishment of the Step1 target
"Radiation dose is in steady decline" has been confirmed. On October 17,
we updated the further progress.
By bringing the reactors and spent fuel pools to a stable cooling
condition and mitigating the release of radioactive materials, we will
make every effort to enable evacuees to return to their homes and for all
citizens to be able to secure a sound life.

Below is the status of TEPCO's major facilities.

* The underlined parts are the updates from the previous press release.

[Nuclear Power Station]

· Fukushima Daiichi Nuclear Power Station: Unit 1 to 3: shut down due to
  the earthquake
  (Units 4 to 6: outage due to regular inspections)

· We found a possibility to detect short-half-life radionuclide such as
  Xe-133 and Xe-135 according to our radionuclide analysis sampled on
  November 1 by the gas management system of the reactor containment
  vessel of Unit 2. We continued to monitor the temperature, pressure and
  data from monitoring post and there was no significant fluctuation from
  those data. As we can't be denied a possibility of fission reactions,
  we decided to start injecting boric acid water from reactor feed water
  system at 2:48 am on November 2 and stopped it at 3:47 pm on the same
  day. At around 7:20 pm on the same day, Japan Atomic Energy Agency
  evaluated that the TEPCO's analysis result of the short-half-life
  radionuclide such as Xe-133 and Xe-135 detection was valid. We consider
  that they were generated by the spontaneous fission on the grounds that
  the concentration of detected short-half-like radionuclide (Xe-135) is
  low, that short-half-like radionuclide (Xe-135) was detected even after
  the boric acid, which stops nuclear fission chain reactions, was
  injected, and that the parameters of the reactor were not significantly
  changed.
· At 10:00 am on November 3, we started transferring accumulated water
  from the basement of the Unit 6 turbine building to temporary storage
  tanks.
· At 12:40 pm on November 3, we started the work to install an additional
  flow meter into the nitrogen gas injection line into Unit 2 to improve
  the reliability of the nitrogen injection. It was finished at 2:00 pm
  on the same day, For this work the nitrogen injection was suspended for
  approximately 10 minutes, however, there were no significant changes in
  the parameters of Unit 2.

· Fukushima Daini Nuclear Power Station:
   Units 1 to 4: shutdown due to the earthquake

· Kashiwazaki Kariwa Nuclear Power Station:
   Units 5, 6: under normal operation
   (Units 1 to 4 and 7: outage due to regular inspections)

[Thermal Power Station]
- Power supply has returned to normal and facilities damaged by the
  earthquake are now being handled in a timely manner.

[Hydro Power Station]
- Power supply has returned to normal and facilities damaged by the
  earthquake are now being handled in a timely manner.

[Impacts on Transmission Facilities]
- Power supply has returned to normal and facilities damaged by the
  earthquake are now being handled in a timely manner.

[Impacts on Power Supply and Demand Balance]
This winter, there will be some minus factors such as the regular
inspection of Unit 5 at Kashiwazaki-Kriwa Nuclear Power Station. On the
other hand, there will be several plus factors such as the recovery of
the common thermal power stations which suffered the earthquake.  As a
result, we expect to secure 54.9 million kW (at the end of December),
54.6 million kW (at the end of January), 53.7 million kW (at the end of
February) supply power.
Compared to the maximum demand in the last winter, which is 51.5 million
kW, we will have 2.2 - 3.4 million kW generation reserve margin.

We expect to maintain stable power supply this winter, however, as there
remains possibilities of unplanned shutdowns at our power stations and
growth in the demand according to the rapid change in the temperature, we
would like to ask your reasonable effort to save electricity. 

We will continue to make our efforts to maintain stable operation and
maintenance of the power facilities in order to "prevent in principle"
the planned blackouts and secure power supply.

Appendix: Past Progress (As of 3:00 pm on November 3, 2011) (PDF 128KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)

* Revised past progress